(September 23, 2019, 9:28 AM EDT) -- It is often the case that tax authorities audit a taxpayer for multiple taxation years. For example, tax authorities could start auditing a corporation today for its 2016, 2017 and 2018 taxation years. If after having completed their audit, tax authorities believe the corporation has failed to declare the entirety of its revenue for more than one of those years, they could issue multiple notices of assessment against the corporation for all the relevant years under audit.

Once the notices of assessment have been issued, the corporation may choose to contest with the Chief of Appeals at the federal level or with the Direction principale des oppositions of Revenu Québec at the provincial level (in Quebec), or even in front of the courts should the contestation at the objection level turn out to be unsuccessful.

Regardless of the ultimate outcome of the objection to notices of assessment or of their contestation in front of the courts, every taxpayer should ask themselves the following question when receiving a notice of assessment: should I pay in advance?

Choosing to immediately pay a notice of assessment that is contested does not equate to an acceptance of the findings of the tax authorities. Even if a taxpayer wishes to contest the assessment, it might be preferable to pay the debt right away.

For example, the immediate payment of a notice of assessment stops the accumulation of interest that grows on the tax debt during the contestation process. Tax authorities apply interest on any tax debt — interest, or penalties, that might still be due after the objection process or the contestation before the courts is over (including an out-of-court settlement). Tax authorities apply daily compounded interest to these amounts at a prescribed rate. Currently, the prescribed rate of interest on tax debts owed to Revenu Québec is seven per cent, while the rate on debts owed to the Canada Revenue Agency is six per cent (applicable from July 1 to Sept. 30).

Further, paying a notice of assessment that is contested right away could result in a generous refund from the tax authorities later on. This will be the case if, for example, the assessment is cancelled at the objection level or before the courts, resulting in a reimbursement of the assessment paid in advance.

Tax authorities will pay interest on the refund computed from the date of the payment by the taxpayer until the day that the refund is issued. The interest rates applicable to refunds issued by tax authorities are lower than those applicable to sums owed by taxpayers to the tax authorities (two per cent for corporations and four per cent for individuals at the federal level; 1.8 per cent for all taxpayers at the provincial level [in Quebec]).

The Federal Court recently had the opportunity to weigh in on the obligation of tax authorities to pay interest on refunds issued to taxpayers. In the case of Glatt v. Canada (National Revenue) 2019 FC 738, the taxpayer had received a notice of assessment of a penalty in the amount of $2.8 million and had contested it by submitting a notice of objection before eventually appealing the assessment in court. In order to minimize the interest accumulating on the fiscal debt, the taxpayer had made a pre-emptive payment of $1 million to the tax authorities.

On appeal, the notice of assessment, which did not relate to a specific year, was cancelled and a new notice of assessment was issued, providing for the refund of the initial payment of $1 million. However, the government was refusing to pay interest on the refund owed to the taxpayer. The new notice of assessment cancelled the first one and referred to the 2012 taxation year. Ultimately, the court found that the new notice of assessment was not reasonable and that tax authorities had to pay interest on the refund of $1 million to the taxpayer.

The option to pay a notice of assessment in advance can be beneficial for a taxpayer even if they intend to object to the assessment. With respect to businesses, they should obviously consider the impact of such a decision on their cash flow.

The content of this article is intended to provide a general guide to the subject matter. Specialist advice should be sought about your specific circumstances.